The invention discloses a configuration method of bus protection with a voltage class of 35kV or less under a complicate connection situation, which comprises the following steps that: 1) two branch circuit breakers of a main transformer are searched for a system bus; 2) two branches of the main transformer are adopted as a boundary point, and a multi-loop network of the bus is unfolded to form a single-loop network; 3) in the principle that the quantity of the connected sections of the bus is not more than 3, a bus sectional circuit breaker on a correspondent position is decomposed, the position is adopted as a boundary node to divide a bus area, and at the same time the bus sectional circuit breaker is used as an ordinary leading-out branch; and 4) by judging the divided bus area, bus protecting apparatuses are configured according to the divided bus areas and the connection requirement of the middle-low-voltage buses. The configuration method has beneficial effect that: the problem that the traditional protecting method cannot satisfy the application requirement can be solved. The quantity of the bus protecting apparatuses can be reduced about 60 percent, the operation maintenance workload can be reduced, the cubicle can be saved, the land occupied area can be remarkably reduced, and the economic benefit is remarkable.