[Objective] As the standard for debugging, opening, acceptance, and subsequent use of computer interlocking devices, the interlocking table plays a crucial role in improving operation efficiency, extending equipment lifespan, and ensuring driving safety in urban rail transit depot. [Method] With a non-ATC (automatic train control) urban rail transit depot in Hangzhou as the research object, the principle and method of determining basic and alternative routes are introduced. The above method is used to seek the conflicting signals in five selected routes. By optimizing the conflicting signal conditions, the interlocking table is simplified, and the patterns of conflicting signals within the interlocking table are summarized. [Result & Conclusion] In the interlocking table, conflicting signals within one route are categorized into five types: the first type is the conflicting signal between the starting and ending buttons in the route; the second is that located in front of the starting button and in the same direction as the starting signaler; the third is that located behind the ending button and in the opposite direction of the starting signaler; the fourth is that when the entrance section signaler and the main departure signaler are juxtaposed and function as the starting signaler in the entrance/exit section; the fifth is that on adjacent track sections in the route. Through the proposed method, the conflicting signals in route can be identified rapidly and accurately, avoiding the miss of conflicting signals or conflicting signal conditions. Through optimizing conflicting signal conditions by finding critical switches, the compilation of the interlocking table is simplified and the design quality of the interlocking table for the depot in urban rail transit is improved.