Abstract: Temporary shielding and plugging technology has been widely used in formation protection to date. Oil soluble temporary plugging agent has its advantages of easy plug releasing in oil, form adjustable in certain temperature and pressure, etc. On the other hand, the use of this product is limited in exploration wells, for its high fluorescence content, which interfere in mud logging and oil reservoir identification. A new kind of non- fluorescence temporary plugging agent, YD-2 is developed in this case. Laboratory evaluation and field tests in two exploration well show that its fluorescence grade is below two, and its soften point is adjustable, while at the same time it is compatible with drilling fluid, and the return permeability reaches as high as 80% or higher.