Based on the Optical Transient Detector/Lightning Imaging Sensor(OTD/LIS) data during 2005-2010, the average detection efficiency of the World Wide Lightning Location Network(WWLLN) is evaluated, mainly for the globe and the "three high lightning activities spots". The peak mean annual flash density of 160.7 km^-2·a^-1 is in the African region according to the OTD/LIS, while via the WWLLN data, the peak of 15.7 km^-2·a^-1 appears in the North American. Due to the inhomogeneous distribution of WWLLN sites, its detection efficiency in different regions is different. In Southeast Asia, South and North America and the African region, they are 8.62%,7.18% and 1.86, respectively. In addition, the detection effciency of the WWLLN also change with month. In Southeast Asia, the detection efficiency maintains the peak in December, amounting to 13.78%, in Africa, it is 2.49% in February, and in South and North America, it reaches 8.44% in October. With the increasing sites and improvement of location method, the WWLLN detection efficiency is also improving. The detection efficiency of WWLLN in three high lightning occurring areas increases annually.