Abstract: TIMAH TASOH Lake Tunnel Project was located at the Perlis province, most northern of the west coast of Malaysia Peninsular. The study area was known for karst topography, ground limestone tower hills very common. Combined with field geological survey and preliminary information, it was mainly introduced of the tunnel project area with lithology, geological structure, meteorology and hydrology. On this basis, starting from the basic necessary conditions analysis of karst, combined with regional macro micro karst law analysis, the evaluation of karst development degree and karst tunnel surrounding rock classification were carried out by the application of fractal theory.karst geology engineering problems probably faced when tunnel constructing were elaborate detailly, and the corresponding countermeasures of design and construction were proposed. Well verified by the tunnel construction practice with the karst geological conditions analysis results, it was worthy of the reference for the same tunnel project construction and design.