Two maize (tea mays, L.) uniformity trials were conducted in the 1995 and 1996 seasons by planting maize variety Three way cross 310 (T.W.C. 310) at the Agricultural Research Station of yids. Experimental plots were arranged to give a wide variety of experimental designs in‌cluding complete and incomplete blocks with single and double control. Efficiency estimates compared with both completely randomized design and randomized complete block design were as follows :- As compared with randomized complete blocks design, the rela‌tive efficiency of split split plot design was 120.91%, split plot was 131.54%, latin square was 140.63%, strip plot was 190.18%. On the other hand, the relative efficiency of randomized complete blocks and latin square designs were 158.69% and 226.84%, respectively as com‌pared with completely randomized design. Concerning the incomplete blocks designs as compared with ran‌domized complete block design, the relative efficiency of simple rectan‌gular Lattice with 4 replication was 124.63%, triple rectongular lattice with three replications was 155.18%, simple square lattice with 4 repli‌cations was 169.18%, single square lattice with 2 replications was 194.68%, balanced lattice with single control was 204.17% and bal‌anced with double control was 263.19%. Generally, it was found that the randomized complete block de‌sign was more efficient than completely randomized, lattice designs were more efficient than randomized complete blocks, balanced incom‌plete block design was more efficient than partially balanced double con‌trol was more efficient than single control, and higher interaction was more efficient than lower and single factors.