Hb 7 (003.9 - 14.9) and Sp 3 (342.5 - 14.3) are high galactic latitude planetary nebulae. Ultraviolet spectra obtained with the IUE reveal UV stellar continuum and P - Cygni stellar wind profiles of NV and CIV indicating post-AGB mass loss from the central stars of these two PN. From an analysis of optical and ultraviolet spectra we have derived the parameters of the central stars and nebulae. The IUE ultaviolet continuum shows that the central stars of Hb 7 and Sp3 are 08 stars. The Si IV 1400A doublet in the spectra of both these stars is very weak or absent most likely due to underabundance of Si and due to also due to earlier spectral type (O 8). The Si IV lines in hot stars are sensitive to surface gravity, their weakness suggests that surface gravity the central stars of Hb7 and Sp3 is relatively higher. The terminal velocity of the stellar wind in Hb7 and Sp 3 are found to be −2460 km/sec and −3630 km/sec respectively.