Forward-Iooking imaging has many potential applications, such as self-landing, navigation, etc. This paper shows a modified hyperbolic approximating method for bistatic forward-looking SAR imaging. Compared with the original hyperbolic approximating, the modified method can handle the bistatic forward-looking geometry better and make the equivalent range history more accurate. Based on the modified approximating method, a modified Omega-k imaging algorithm is deduced. Finally, numerical simulations are used to validate the proposed modified hyperbolic approximating and the imaging algorithm.