Disaster preparedness （protective） activities are very important for business continuity. However，few studies have explored this issue in last several decades. This paper reanalyzed the disaster preparedness （protective） activity patterns and determinants from a business & disaster research dataset which included 933 business organizations. This dataset was collected by the Disaster Research Center in 1997 from Santa Cruz County，California which was hardly hit by the 1989 Loma Prieta earthquake using mailed questionnaire surveys. Factor analysis results indicated that the protective activities in these business organizations had four patterns：planning/training，resource preparation，knowledge enrichment，and insurance purchasing. OLS regression model revealed that the significant determinants of overall protective activities in business organizations were firm size，which was measured by the number of employees；lifeline loss which was the proxy of disaster disruption experience and decision maker’s risk perception. Also，the variance between different business sectors，especially between the wholesale/retail and Finance/Insurance/Real estate was significant. However，the effects of these influential factors on the four different protective activity patterns varied in the four separated models. Finally，some implementation and limitation of this analysis discussed.