The study aimed to predict the positive thinking through psychological resilience and mental alertness. The sample of the study consisted of 393 students from grade 10 and grade 11 students in government schools in the governorate of Al-Dhakilia governorate in the Sultanate of Oman. The study used Ingram and positive thinking measurement (Ingram & Wisnicki, 2005), psychological resilience measurement (Conor & Davidson, 2003) and Lager's mental alertness (1992). The results showed a high level of positive thinking, an average level of psychological resilience, A low level of mental alertness in the sample study, as shown by statistically significant differences in positive thinking in favour of males, while there are no statistically significant differences in mental alertness and psychological resilience attributable to the gender variable in the study sample. The results also revealed that there are a statistically significant differences in positive thinking attributable to the class variable in favour of students in grade 10 and statistically significant differences in psychological resilience in favour of students in grade 11, while there are no statistically significant differences in mental alertness attributable to the class variable. The study concluded that positive thinking was predictable through psychological resilience and mental