The invention relates to an existing navigation system-based optimal passing point selection method with limited constraint conditions. The method is technically characterized by comprising the following steps: after inputting a start position, a destination and traveling preference, setting passing points, and constraint conditions by using an optimal passing point selection module; automatically searching on an electronic map to find all passing point positions meeting requirements; according to the travelling preference of a user, planning all routes including the start position, the passing points and the destination; calculating the evaluation value of each route under the measurement criteria of the travelling preference and ranking according to the evaluation values; selecting the optimal route, so that the user drives according to an optimal passing point and the optimal route. The method disclosed by the invention can help the user to automatically select the optimal passing point that meets the traveling preference from a great number of passing points that satisfy the limited constraint conditions and plan the optimal route including the passing point, so as to save time, spent in selecting and comparing the passing points, of the user, greatly facilitate the travel of people, and realize practical significance and value.