As the large optoelectronic tracking device has the features of high tracking and measuring precision, large inertia and small field, it has no ability to search targets in large sky scope. Generally, it depends on the leading information from radars to find targets. Once the information′s error exceeds the field of the device, it′s hard for the optoelectronic tracking device to find the target. A quick helical search method in small sky scope was proposed based on the leading information. According to system model simulation and experiments, the method helped the large optoelectronic tracking device to capture target quickly when the target′s leading information error outranged the field. The acquisition probability of targets was increased from 20% to 70% when the leading information error was less than twice of the device field. The turntable runned smoothly when applying this search method, and the searching parameters can be changed flexibly according to properties of different optoelectronic devices, features of targets and targets guiding error. It greatly improves acquisition probability of targets, and it is a kindpractical and effective method for large optoelectronic device to find targets quickly in small sky scope. This method has high versatility.