We present the photometric results of the eclipsing cataclysmic variable ( CV ) WZ Sge near the period minimum ( P _ { min } ) .
Eight new mid-eclipse times were determined and the orbital ephemeris was updated .
Our result shows that the orbital period of WZ Sge is decreasing at a rate of \dot { P } = -2.72 ( \pm 0.23 ) \times { 10 ^ { -13 } } ss ^ { -1 } .
This secular decrease , coupled with previous detection of its donor , suggest that WZ Sge is a pre-bounce system .
Further analysis indicates that the observed period decrease rate is about 1.53 times higher than pure gravitational radiation ( GR ) driving .
We constructed the evolutionary track of WZ Sge , which predicts that P _ { min } of WZ Sge is \sim 77.98 ( \pm 0.90 ) min .
If the orbital period decreases at the current rate , WZ Sge will evolve past its P _ { min } after \sim 25.3 Myr .
Based on the period evolution equation we find \dot { M } _ { 2 } \simeq 4.04 ( \pm 0.10 ) \times 10 ^ { -11 } M _ { \odot } yr ^ { -1 } , which is compatible with the current concept of CV evolution at ultrashort orbital periods .