During times of high market volatility, strategic asset allocation is crucial for portfolio managers. A new model combining Black-Litterman with Markov Regime-Switching in GARCH process helps investors allocate assets based on changing volatilities and achieve superior returns. Testing the model from 1969 to 2011 showed promising results, especially during the 2008 financial crisis. Time-varying asset returns play a significant role in portfolio performance, and the new model provides a robust and sophisticated approach for managing risks and maximizing returns.