The following is a framework for a cryptocurrency contract long position investment strategy based on the three major indicators of EMA, MACD, and RSI, combined with trend analysis and dynamic risk control mechanisms:

One, Core Trend Judgment (EMA Dominates)

1. EMA Period Selection

- Short-term EMA: 7 periods (capture short-term trends)

- Medium-term EMA: 30 periods (determine medium-term direction)

- Long-term EMA: 100/200 periods (identify major trends)

2. Trend Confirmation Rules

- Bullish Divergence: Price > EMA7 > EMA30 > EMA100, and moving averages are arranged in upward diverging order

- Dynamic Support: Price retraces to near EMA30 with reduced volume stabilizing (best entry point)

- Golden Cross Signal: EMA7 crosses above EMA30 (must be accompanied by increased volume)

Two, Auxiliary Verification Indicators (MACD+RSI)

MACD Application

1. Trend Momentum Judgment

- Histogram continuously expands: Bullish momentum strengthens

- DIF and DEA operate above the zero line: Bulls dominate the market

2. Key Signals

- Golden cross at the zero line: DIF breaks DEA from below (strengthens long signal)

- Bottom Divergence: Price makes a new low but MACD low moves up (potential reversal signal)

RSI Application

1. Overbought/Oversold Filtering

- In an uptrend: RSI>70 does not blindly take profit, RSI retracing to around 50 is seen as a positioning opportunity

- In a downtrend: RSI<30 must be wary of false rebounds

2. Trend Strength Verification

- Strong Bullish: RSI consistently oscillates between 55-70

- Breakout Signal: RSI strongly rises from below 50 to above 60

Three, Long Position Strategy Execution Process

Entry Conditions (must meet simultaneously)

1. Price stabilizes above EMA30 and EMA is in bullish arrangement

2. MACD Histogram continuously expands for 3 consecutive bars (green bars increase)

3. RSI rebounds from below 50 to above 55

4. Breakout with increased volume and bullish candlestick breaking previous high (volume>1.5 times the average of the previous 3 days)

Exit Strategy

1. Active Profit Taking

- When RSI>85 and a long upper shadow appears

- MACD Histogram continuously shortens for 2 consecutive bars

- Price breaks below EMA7 (partial profit taking)

2. Forced Stop Loss

- Price breaks below EMA30 and does not recover within 30 minutes

- Maximum loss does not exceed 2-3% of capital

Positioning Rules

- Initial Positioning of 30%

- Price retraces to EMA30 without breaking, position 20%

- MACD second golden cross and RSI>60 position 20%

Four, Risk Management Supplement

1. Leverage Control: For perpetual contracts, it is recommended not to exceed 5x leverage

2. Timeframe Filtering: Avoid major policy releases 1 hour before and after

3. Cross-timeframe Verification: Prioritize resonance between 4-hour trend and 1-hour signals

4. Black Swan Protection: Set up hedge positions (e.g., buy Put Options)

Five, Strategy Advantages/Limits

Advantages:

- EMA provides a clear trend channel, MACD verifies momentum, RSI filters false breakouts

- Suitable for high liquidity coins like Bitcoin/Ethereum trend markets

Limitations:

- Sideways markets can frequently trigger stop losses (must be filtered with volatility indicators)

- Extreme market conditions require manual intervention (e.g., events like the 2022 LUNA collapse)

Six, Practical Cases (BTC/USDT)

October 2023 Market:

1. On October 16, EMA7 crosses above EMA30, MACD golden cross at zero line

2. RSI rises from 48 to 55, breaking through $28,000 with increased volume

3. Pullback to EMA30 ($27,200) stabilizes, eventually reaching $35,000

4. When RSI reaches 88, trigger a profit-taking signal

Note: It is recommended to first backtest with historical data (2021 bull market/2022 bear market/2023 sideways market), optimize parameters before going live. Contract trading requires strict position management and emotional control.