The proper conservation during storage recovers the production costs. So for continuous market supply, the proper conservation methods should be used. The effect of conserv ation period on the external and internal changes of fruit can be studied by measuring its physical parameters. To achi eve this goal, the effects of storage period and fruit size on some physical attributes of orange ( cv . Valencia) such as mass, volume, true density, rind ratio and moisture content are investigated. Factorial experiment in the f orm of randomized design with 32 replications is applied . The result shows that the effect of storage period on all physical parameters is significant at 1% level; and with increasing time, true density increases while all other physical parameters decrease. Also it is found that fruit rind ratio and moisture content increase with increasing fruits size while the true density decreasing

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