The effect of $eta$-heat treatment on th microstructure, mechanical properties and texture in the nuclear fuel cladding of Zircaloy-4 tubes was chosen at 1000, 1100 and 120$0^{circ}C$, and the tubes were heat-treated by a high frequency vacuum induction furnace. Morphology of the second phase particles and $alpha$-grain of as-received tubes were markedly changed by heat treatment. The average sizes of second phase particles of as-received and $eta$-heat treated tubes were 0.1$mu extrm{m}$ and 0.076$mu extrm{m}$, respectively. However, the average sizes of second phase particles were not much changed in the $eta$-heated temperatures. With increasing heat treatment temperatures, the 0.2% yield strength and the hoop strength were decreased because of changes in preferred orientation as will as $alpha$-plate width. Heat treated Zircaloy-4 tubes exhibited texture changes but the preferred orientation of grains still remained.