Drying shrinkage of polypropylene fiber reinforced glazed hollow beads thermal insulation mortar was measured by vertical length comparator, and cracking was measured by ring method. The influences of polypropylene(PP) fiber with different contents and lengths on the long term drying shrinkage and cracking were investigated. Mass loss was measured by weighting method to reflecting the water loss degree, and pore structure was characterized by nitrogen adsorption/desorption method, the correlation among them was researched. The results show that drying shrinkage process of polypropylene fiber reinforced glazed hollow beads thermal insulation mortar includes three steps with the curing time extension：the acceleration period（before 7d）, the deceleration period（7365d） and the metastable period（after 365d）. The drying shrinkage of mortar in the first stage increases quickly owing to the fast dehydration, but its development in the last two stages is attributed to pore structure of mortar with radius less than 500nm, which has linear relationship with the pore volume fraction of the pore with the sizes of 7.3nm to 123nm. And there is no change in the drying shrinkage development trending of glazed hollow beads thermal insulation mortar with the PP fiber addition and three steps with the curing time extension still takes place, but it restrains significantly drying shrinkage value at any curing time. The effect of cracking resistance of PP fiber enhaces with increasing fiber content and increment in length of PP fiber, which reduces the width and length of cracking and causes the total cracking values of mortar to reduce greatly.