In recent years, cement mortar composed with lightweight aggregates has been frequently adopted as one of finishing materials in plastering works due to the high operating efficiency. This paper concerns about the drying shrinkage strain and the mass reduction ratio of the mortar with four kinds of mortar flow, sometimes lead to the exfoliation, under the standardized atmosphere during 28 days. As a result, the following items are clarified; 1) Drying shrinkage strain of upside is larger than that of downside in all kinds of mortars. Therefore the renderings draw outward curve. 2) Although the strains after 28 days in air was about 1500 micro which different was very little from the kinds of mortars, this value was some times as large as the mortar with normal fine aggregates. 3) The more the mortar flows, the smaller the mass reduction ratio is produced. 4) The movement characteristics of the mortar are considerably different from those of the mortar with fine aggregate.

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