The invention discloses an entrance lane design method for eliminating starting loss time and a signal optimization method. The entrance lane design method is characterized by comprising the following steps: S1, acquiring data of an intersection, including the design speed at the intersection, the conflict point position of the intersection, the driving track distance from each lane at the intersection to the conflict point, the vehicle acceleration time, the deceleration time, and the acceleration or deceleration distance; S2, adding multiple groups of parking lines to each lane of the entrance lane at the intersection; and S3, setting signal lights at set distances along the heading direction of vehicles on each newly added parking line. The traffic flow completes acceleration in the entrance lane under control. Under the condition of avoiding conflict with the traffic flow of previous phase, the traffic flow is enabled to pass through the intersection at a saturation flow rate in the green light time. The signal loss time at the start of the green light and the signal loss time at the end of the yellow light are eliminated. The green time at intersections is utilized efficiently. The traffic capacity and service level at intersections are maximized. The traffic delay is reduced.