Before revision:  The ] basic risky asset price model  we construct here is  drift uncertain and volatility uncertain , we describe such model by using general G-Brownian motion and call it as G-asset price system.
After revision:  We use the nonlinear analysis tool, i.e., G-frame work ] basic risky asset price model we construct here is drift uncertain and volatility uncertain , we describe such model by using general G-Brownian motion and call it as G-asset price system.